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From Nicolas De Loof <>
Subject [collection] can I avoid synchronized using a ReferenceMap ?
Date Fri, 10 Jun 2005 08:10:08 GMT


I'm building an UDP based integration service. Each 'client' sends a 
query on UDP socket and waits for the response. A thread receives all 
responses and dispatch to clients.

My current implementation uses an object that is used as message 
When sending a message, the client adds its messageId object into a 
shared map. After sending it's message, it does an 'messageId.wait()'.
The receive thread lookup the map for received id and calls notifyAll() 
on the associated messageId Object. The client is unlocked and can 
process response.

I'd like to avoid using a synchronized map, and I've read in 
commons-collection javadoc about the ReferenceMap. Could it be used for 
this ?
If I've understood how it works, I'm not required to remove my MessageId 
objects from the map, and they will be removed when garbage collector 
finalize my MessageId (after the UDP response has been processed).

Any suggestion is welcome.


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